Lene Hau. Lene Vestergaard Hau (born November 13, 1959 in Vejle, Denmark) is a Danish physicist. In 1999, she led a Harvard University team who, by use of a Bose-Einstein condensate, succeeded in slowing a beam of light to about 17 metres per second, and, in 2001, was able to stop a beam completely.
Zeta is the sixth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 7. It was derived from the Phoenician letter zayin. Letters that arose from zeta include the Roman Z and Cyrillic Ð.
Zeta potential - Application trends. The zeta potential (x), or electrophoretic mobility (Âµ E), is increasingly being used to investigate fine particle systems. The zeta potential is a consequence of the existence of surface charge, and can give information on electrical interaction forces between the dispersed particles. Using DLVO theory, it is possible to assess the stability of suspensions and emulsions by means of the zeta potential.